404021389 has 8 divisors (see below), whose sum is σ = 416528640. Its totient is φ = 391597776.

The previous prime is 404021369. The next prime is 404021411. The reversal of 404021389 is 983120404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404021389 - 2²⁷ = 269803661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404021389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404021329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11029 + ... + 30490.

It is an arithmetic number, because the mean of its divisors is an integer number (52066080).

Almost surely, 2^404021389 is an apocalyptic number.

It is an amenable number.

404021389 is a deficient number, since it is larger than the sum of its proper divisors (12507251).

404021389 is a wasteful number, since it uses less digits than its factorization.

404021389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41819.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 404021389 is about 20100.2833064611. The cubic root of 404021389 is about 739.2672250696.

The spelling of 404021389 in words is "four hundred four million, twenty-one thousand, three hundred eighty-nine".